Results: Sensation-seeking comprised extraversion and openness to experience. It was more appropriately described as Behavioural-Stimulation-and-Sensation-Seeking (BStim-SS). BStim-SS related to drug and poly-substance dependency but not alcohol-only deendency. Increased impulsivity was related to all sustance use dependencies.

Conclusions and implications for practice: The BStim-SS presents as a valuable concept to apply to forensic populations. It captures the need for behavioural and emotional stimulation and lends support to Reward Discounting theory as valuable to apply across substance dependency. Implications for practice include:

* A need to identify a broader concept of sensation-seeking for prisoner samples:* The recognition of differences within substance dependent samples, with impulsivity presenting differently across drug and/or alcohol dependent groups;*Recognition that concepts regularly applied to community samples need to be examined more specifically among forensic samples to ascertain validity.